Use random port for cargo test (vercel#70926)

We can't guarantee this port will always be available so use random one
instead

x-ref:
https://github.com/vercel/next.js/actions/runs/11221640914/job/31192432034

turbopack/crates/turbopack/tests/node-file-trace/integration/socket.io.js

@@ -1,6 +1,6 @@
 const http = require("http");
 const io = require("socket.io");
-const opts = { port: 3000 };
+const opts = { port: 0 };
 const server = http.createServer((req, res) => {});
 server.listen(opts.port);
 server.close(() => {